Re: [Qemu-devel] [RFC 3/6] kvm: add kvm_get_max_vm_phys_shift

[David Gibson]

On Wed, Jun 20, 2018 at 03:07:30PM +0200, Eric Auger wrote:
> Add the kvm_get_max_vm_phys_shift() helper that returns the
> log of the maximum IPA size supported by KVM. This capability
> needs to be known to create the VM with a correct IPA max size
> (kvm_type passed along KVM_CREATE_VM ioctl.
> 
> Signed-off-by: Eric Auger <address@hidden>
> ---
>  accel/kvm/kvm-all.c    | 7 +++++++
>  accel/stubs/kvm-stub.c | 5 +++++
>  include/sysemu/kvm.h   | 1 +
>  3 files changed, 13 insertions(+)
> 
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 0590986..137c38e 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -280,6 +280,13 @@ static int kvm_set_user_memory_region(KVMMemoryListener 
> *kml, KVMSlot *slot)
>      return ret;
>  }
>  
> +int kvm_get_max_vm_phys_shift(MachineState *ms)
> +{
> +    KVMState *s = KVM_STATE(ms->accelerator);
> +
> +    return kvm_ioctl(s, KVM_ARM_GET_MAX_VM_PHYS_SHIFT, 0);

From the ioctl() name, I'm assuming this is an ARM specific call.

In which case, shouldn't it be in target/arm.kvm.c, not kvm-all.c ?

> +}
> +
>  int kvm_destroy_vcpu(CPUState *cpu)
>  {
>      KVMState *s = kvm_state;
> diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c
> index 02d5170..7575ba7 100644
> --- a/accel/stubs/kvm-stub.c
> +++ b/accel/stubs/kvm-stub.c
> @@ -161,6 +161,11 @@ bool kvm_has_free_slot(MachineState *ms)
>      return false;
>  }
>  
> +int kvm_get_max_vm_phys_shift(MachineState *ms)
> +{
> +    return 0;
> +}
> +
>  void kvm_init_cpu_signals(CPUState *cpu)
>  {
>      abort();
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index 0b64b8e..240e3d9 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -206,6 +206,7 @@ extern KVMState *kvm_state;
>  /* external API */
>  
>  bool kvm_has_free_slot(MachineState *ms);
> +int kvm_get_max_vm_phys_shift(MachineState *ms);
>  bool kvm_has_sync_mmu(void);
>  int kvm_has_vcpu_events(void);
>  int kvm_has_robust_singlestep(void);

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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